package com.scy.boot02.controller;

import com.scy.boot02.entity.Product;
import com.scy.boot02.utils.DBUtil;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

@RestController//使用此注解相当于在每个方法前面加了一个@ResponseBody
public class ProductController {
    @RequestMapping("/insert")
    public String insert(Product product){
        System.out.println("product = " + product);
        PreparedStatement ps = null;
        try(Connection conn = DBUtil.getConnection();) {

            String sql = "insert into product values(null,?,?,?);";
            ps = conn.prepareStatement(sql);
            ps.setString(1, product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            ps.executeUpdate();

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {

        }
        return "添加完成<a href='/'>返回首页</a>";
    }
    @RequestMapping("/select")
    public String select(){
        //新建集合封装数据
        ArrayList<Product> list = new ArrayList<>();
        try(Connection conn = DBUtil.getConnection()) {
            String sql = "select * from product;";
            PreparedStatement ps = conn.prepareStatement(sql);
            //执行查询语句 得到结果集对象
            ResultSet rs = ps.executeQuery();
            //遍历结果集对象
            while (rs.next()){
                int id = rs.getInt(1);
                String title = rs.getString(2);
                double price = rs.getDouble(3);
                int num = rs.getInt(4);
                //创建商品对象封装查询到的数据
                Product p = new Product();
                p.setId(id);
                p.setTitle(title);
                p.setPrice(price);
                p.setNum(num);
                //把商品对象添加到集合中
                list.add(p);
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        //把list集合中的数据装金表格标签
        String html = "<table border='1'>";
        html+="<caption>商品列表</caption>";
        html+="<tr><th>id</th><th>标题</th><th>价格</th><th>库存</th><th>操作</th></tr>";
        for (Product p :
                list) {
            html+="<tr>";
            html+="<td>"+p.getId()+"</td>";
            html+="<td>"+p.getTitle()+"</td>";
            html+="<td>"+p.getPrice()+"</td>";
            html+="<td>"+p.getNum()+"</td>";
            //http://localhost:8080/delete?id=xxx
            html+="<td><a href='/delete?id="+p.getId()+"'>删除</a></td>";
            html+="</tr>";
        }
        html+="</table>";
        return html;
    }
    @RequestMapping("/delete")
    public String delete(int id){
        System.out.println("id = " + id);
        try(Connection conn = DBUtil.getConnection();) {
            String sql = "delete from product where id>?;";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1,id);
            ps.executeUpdate();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return "删除成功！<a href='/select'>返回列表页面</a>";
    }
    @RequestMapping("/update")
    public String update(Product product){
        System.out.println("product = " + product);
        try (Connection conn = DBUtil.getConnection();){
            String sql = "update product set title=?,price=?,num=? where id= ?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            ps.setInt(4,product.getId());
            ps.executeUpdate();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return "修改完成！<a href='/select'>返回列表页面</a>";
    }

}
